Help with box for Avalanche

I wanna build a box for 2 Kicker VR 15"s in my avalanche. Preferably a bandpass box or whatever would be the best box for SPL. I plan on running around 200 watts to each 15" and space is not a problem. The bed is connected to the cab in this truck so I can make the box as big as it needs to be. Can somebody help me design this box please.